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What is it?[edit]

Salinity is the saltiness or dissolved salt content of a body of water. It is a general term used to describe the levels of different salts such as sodium chloride, magnesium and calcium sulphates and bicarbonates.

It is typically expressed in the unit - parts per thousand (ppt) or approximately grams per litre. To measure this accurately in an aquarium you need to use a hydrometer or refractometer.

Specific gravity at 25°C (77°F) salinity (ppt)
1.018 26.9
1.019 27.8
1.020 28.7
1.021 30.6
1.022 31.5
1.023 33.4
1.024 34.3
1.025 36.2
1.026 37.1